Marine Weather Net

Straits of Florida from west end of Seven Mile Bridge to south of Halfmoon Shoal out 20 to 60 NM Marine Forecast


10 - 15




15 - 20



The Marine Weather Forecast In Detail:
GMZ074 Forecast Issued: 1028 PM EST Thu Feb 25 2021

Overnight...Northeast To East Winds 10 To 15 Knots, Becoming East. Seas 2 To 4 Feet. Isolated Showers.
Friday...East Winds Near 15 Knots, Increasing To 15 To 20 Knots. Seas 3 To 4 Feet, Building To 4 To 5 Feet.
Friday Night And Saturday...East To Southeast Winds 15 To 20 Knots. Seas 4 To 6 Feet.
Saturday Night...East To Southeast Winds Near 20 Knots. Seas 5 To 7 Feet.
Sunday...East To Southeast Winds 15 To 20 Knots. Seas 4 To 7 Feet.
Sunday Night...East To Southeast Winds 15 To 20 Knots. Seas 4 To 6 Feet.
Monday...East To Southeast Winds Near 15 Knots. Seas 3 To 5 Feet.
Monday Night...East Winds 10 To 15 Knots. Seas 2 To 4 Feet.
Tuesday...East Winds Near 10 Knots. Seas 1 To 3 Feet.
Tuesday Night...East To Southeast Winds 10 To 15 Knots. Seas 2 To 3 Feet.
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Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas: GMZ005
1028 PM EST Thu Feb 25 2021

A fractured high pressure system draped across Florida will move into the western North Atlantic tonight. A dominant dome of high pressure will push off the Mid- Atlantic and New England Coasts Friday and Friday night. Fresh east to southeast breezes will persist Friday night through Sunday night, with the strongest winds Saturday night. Breezes are expected to subside Monday and Monday night.

Gulf Stream
The Approximate Shoreward Edge of the Gulf Stream as of February 25...
- 62 NM South of Dry Tortugas Light...on Loggerhead Key.
- 26 NM South of Cosgrove Shoal the Marquesas Keys.
- 17 NM South of Sand Key Key West.
- 17 NM South of Looe Big Pine Key.
- 15 NM South of Sombrero Key Marathon.
- 11 NM Southeast of Alligator Reef Islamorada.
- 10 NM Southeast of Molasses Reef Key Largo.
- 5 NM East of Carysfort Reef Ocean Reef.
Area Forecast Discussion
National Weather Service Key West FL
1028pm EST Thu Feb 25 2021

Currently - A weak high pressure system sits across Florida, resulting in light mostly northeast to east breezes across the Keys and surrounding waters. A strong subsidence inversion is based a little below 750 mb with very dry air aloft. Earlier in the evening this allowed a few showers to develop along boundaries with a relatively moist boundary layer and some room for development. All activity within our area has since dissipated, but a few showers are approaching our eastern Florida Straits. The associated decks of stratocumulus has also mostly evaporated.

Short Term Update
Weak ridging will remain across Florida through the overnight period keeping winds light out of the northeast to east. Lower to mid level ridging will persist along with very dry air aloft. Rain chances will remain slim to none through the overnight period with most of the incoming shower activity likely remaining over the Florida Straits. Temperatures will bottom out in the lower 70s. A bit warmer than last night due to the more veered flow. The more veered flow will also allow dew point temperatures to creep upwards towards 70.

Weak high pressure across Florida will result in light winds becoming more east northeast to east by morning. No significant changes made in the evening marine update.

NOAA Key West FL Office: Watches - Warnings - Advisories
FL...None. GM...None.